Chemical Elements | Part 1 | Alkali Metals

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Generally soft and silvery and very good conductors of heat and electricity; they are very reactant with nonmetals and break down in cold water.

alloy  = a metal that is formed by mixing two types of metal together, or by mixing metal with another substance 

sodium chloride = NaCl

fertilizer = a substance added to soil to make plants grow more successfully 

life span = the length of time for which a person, animal, or thing exists


EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.